That’s quite a claim. But I think I can back it up. (This thing also requires little time or money, meaning it’s also high ROI).

First, let’s define terms.

• By “increase trust,” I mean something Person A can do that increases their probability of being trusted by Person B;
• By “fastest,” I don’t mean easiest, nor most powerful. I mean least elapsed time between interaction and resultant trust.
• By “trust,” I mean legitimate trust, trustworthiness on the part of Person A. No fakery.

It’s simple, though not easy. Let me tell you what it is; then give you 11 reasons why it is indeed the single fastest way to increase trust.

It is simply this:

Return calls and emails really fast.

Joe, I want to let you know I got your message. I may not get to it until Thursday, but I want to let you know I’m on it. I’ll be working it between now and then. It’s on my to-do list, it’s in my mind first thing in the morning and last at night. You can take it off your worry list, I’m on the case.

Now let’s explore what this does for you and your client.

1. It immediately removes FUD (fear, uncertainty and doubt) from your client’s mind. All those concerns (did he get it? why hasn’t he answered me yet? was it something I said? Is he avoiding me? is he fighting me?) are gone. Cut off. Stopped cold. You have committed to engage.

2. It allows you to proactively schedule things out to Thursday. (Don’t worry—if they actually do need it Tuesday, they’ll be back to you about it).

3. By making a commitment to engage, you create a chance to improve your perceived reliability and integrity—by proceeding to do just what you said you’d do.

4. It demonstrates your attentiveness to the client’s issue.

5. It demonstrates your sensitivity to the client’s time needs.

6. It forces you to address an issue. The tougher and more difficult the issue, the more important this is. How many people have not returned your call in the last three days? The more uncomfortable an issue is, the more likely we are to delay, or avoid, facing it. Unfortunately, the other person knows it. They in turn silently accuse us of passive-aggressive avoidance. And they’re right.

7. By dealing with tough issues—putting them squarely on the table—we show that we are not afraid to constructively engage. The work of John Gottman in marriages shows the enemy of relationships is not confrontation, but disengagement. Returning that difficult phone call forthrightly builds relationships.

8. By scheduling it for Thursday, you show that you’re in charge of your schedule, therefore an efficient server of clients.

9. By scheduling it forthrightly, you show confidence that you can deal with the issue, and confidence itself is confidence-inspiring (I’m assuming here you can back it up).

10. By responding quickly and directly, you validate the client’s sense of the issue as being accurate and timely.

11. You’re going to have to deal with this thing anyway. You can do it efficiently, effectively and confidently and gain all the above benefits; or you can put it off hoping either the issue will die, the muse will descend from the heavens, or the client will forget about it.